Welcoming questions
- Can you tell us about your journey with Java and the kinds of systems you have built with it?
- What do you enjoy most about working on backend services?
Role-specific / technical competencies
- How do you decide between using an ORM like Hibernate and writing plain SQL for a given feature?
- Explain how you have handled concurrency in a Java application. What tools from the language did you use?
- Walk us through how a Spring Boot application you built was structured, from controller to database.
- Tell us about a memory or garbage collection issue you diagnosed. How did you find it and what fixed it?
- How do you approach testing a service that depends on a database and an external API?
Behavioural & culture fit
- Tell us about a time you pushed back on a design decision. What was your reasoning, and what happened?
- Describe how you have shared Java knowledge with less experienced teammates.
- How do you keep up with changes in the Java ecosystem, and what recent change have you actually adopted?
Problem-solving / case
- A REST endpoint that normally responds in 100 milliseconds now takes 5 seconds under load. How do you investigate?
- You need to migrate a monolith module into a separate Spring Boot service without downtime. Outline your plan.
- A scheduled batch job occasionally processes the same record twice. What are the likely causes and how would you fix them?
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